Valveworks has grown to have the largest, most comprehensive API 6A gate valve product line of any independent in the world. ... Our business is to support industry requirements at the wholesale level for API 6A wellhead products, primarily gate valves and valve components. Valveworks USA has been dedicated to excellence in the Oil and Gas Industry since 1993. With continued dedication to customer support, Valveworks manufactures the highest quality API 6A product line. read more